Inventory must be installed grounding or zero electrical equipment

The so-called protective grounding, that is, the neutral point of the electrical equipment and electrical devices, housings or brackets under normal circumstances with the grounding for good electrical connection to prevent electrical equipment damage caused by electrical shock accident. Starting from this purpose, the following equipment must be well protected housing grounding:

(1) generator, motor, transformer and other high and low voltage electrical equipment metal shell and base.

(2) Operation of various electric equipment Metal frame of transmission mechanism and power distribution unit, switchboard, control panel, etc., metal frame of indoor and outdoor power distribution unit, and concrete frame.

(3) High-voltage overhead transmission and distribution lines tower and the pole mounted on the circuit breakers , disconnectors, capacitors (group) shell.

(4) transformer secondary winding.

Protection of zero is neutral in the power supply low voltage system, the electrical equipment metal shell, the frame and the neutral phase, the neutral resistance is very small (compared with the resistance of the ground), when the electrical insulation Damage and touch the shell, it will have a great short-circuit current circuit protection switch or the protection of the fuse disconnect, cut off the power supply, to avoid personal and equipment hazards.

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